In the early days of space exploration, walking on the moon wasn’t the only problem facing Soviet cosmonauts; they also had difficulty walking on Earth after they returned from prolonged flights. The lack of gravity in orbit caused very serious and life-threatening...

In August of 480 BC, a few hundred Spartans led by King Leonidas battled against 150,000 Persian warriors led by King Xerxes. The heavily outnumbered Greeks held their ground, repelled the invaders, and controlled the battle for three days. But there was one thing...

Running a 5K isn’t easy. The course stretches 3.1 miles long and can be filled with hills and headwinds. Successful runners know it takes a good pair of running shoes, plenty of training, and unflinching endurance to finish strong. And it doesn’t hurt to have a good...